exhaust system

[exo311]

I was wondering if you could shed some light on my problem.

I recently had a full exhaust system put in on my 2000 1.5 DOHC accent (pacemaker extractors, high flow cat, 2" madrel bent exhaust, 1 resonator, 1 muffler)

The performance gains are good, with more torque and now no restriction high in the rev range.
However, there is a loud 'crackle' in the note whenever I snap open the throttle. It sound like a vibration. The crackle can be annoying;, other than that the sound is good.

It mostly occurs about 2000 - 3500 revs, however the effect is less noticable when I'm orignally on some throttle or half throttle (already under load). Eg. on the highway in 4th gear and I plant my foot up a hill, it does it less then when I'm starting from zero.

The exhaust workshop where I had it fitted said they've done dozens of excels with no problem but the LC accent always had this problem with a free-flowing exhaust. They put it down to the engine, but is this true?

Any comments? Thanks for your input.

[sk8rpunkn8]

after i got my exhaust finally done, my car made a buzzing noise in upper rpm range. there have been others that have noted the same thing. i am not quite sure what can be done to solve it, but you are not alone when it comes to this noise.

[VALKYRIE YB70]

Exo!......this seems to happen when stainless steel headers are fitted to all the [4 Hyundai engines.
It`s connected with resonance/harmonics caused by the thinner stainless steel.
You MAY improve the sound by heat-wrapping the headers & downpipe, but it`s a good mod. anyway, as it will cut down the heat increase under your bonnet which your new headers will likely have caused.
Ceramic coating is a more expensive option.
Cheers,
Nick.

[buddyholly]

engines

[body][/body]

this seems to happen when stainless steel headers are fitted to all the I4 Hyundai.

my accent makes a buzzing sound above 3500rpm
im running a stainless header with stock exhaust

[buddyholly]

engines

[body][/body]

this seems to happen when stainless steel headers are fitted to all the I4 Hyundai.

my accent makes a buzzing sound above 3500rpm
im running a stainless header with stock exhaust